My guess would be NO! This is just one of those things (like the color of the command buttons) that MS insists on controlling. If it's really important to you, however, you could set the form's property for the Navigation Button to NO and place command buttons (made to imitate the Navigation Buttons) at the top of the form. You'd have to place code behind these buttons to take care of the navigation chores, but that's not really difficult.
Hope this helps!
The problem with making anything foolproof...is that fools are so darn ingenious!
All posts/responses based on Access 2003/2007